https://doi.org/10.1140/epjd/e2008-00227-7
Quantum cloning machine of a state in a belt of Bloch sphere
1
Department of Physics, Tsinghua University, Beijing, 100084, P.R. China
2
Department of Mathematical Sciences, Tsinghua University, Beijing, 100084, P.R. China
3
Tsinghua National Laboratory for Information Science and Technology, Beijing, 100084, P.R. China
Corresponding author: a This email address is being protected from spambots. You need JavaScript enabled to view it.
Received:
26
July
2008
Revised:
28
October
2008
Published online:
5
December
2008
Abstract
We analyze the problem of approximate quantum cloning when the quantum state is between two latitudes on the Bloch's sphere. We present an analytical formula for the optimized 1-to-2 cloning. The formula unifies the universal quantum cloning (UQCM) and the phase covariant quantum cloning.
PACS: 03.67.-a – Quantum information
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2008
